Not every HVAC company that shows up in a search result is equally qualified to work on your furnace or AC. Here’s what actually matters when you’re choosing one in Ontario.
Ask About TSSA Licensing
In Ontario, anyone working on gas-fired appliances — including most furnaces — is legally required to hold certification through the Technical Standards and Safety Authority (TSSA). This isn’t optional paperwork; it’s what confirms a technician has been trained to work safely around gas lines, venting, and combustion. Ask directly whether the technician coming to your home is TSSA-certified.
Understand How They Price Repairs
Some companies quote an hourly rate that can balloon once they’re on-site. Others, like us, quote a flat rate for the job before any work starts, so you know the cost upfront regardless of how long the repair takes. Ask for a firm number before you agree to anything.
Check Their Actual Response Time
“24/7 emergency service” means different things to different companies. Some route your call to an answering service that takes a message; others have a live dispatcher who can tell you, on the spot, when a technician will actually arrive. If you’re calling because your furnace died in January, that difference matters.
Ask What Brands They Service
A company that only knows one or two furnace brands well may struggle — or push you toward a costly replacement — when they encounter something else. Look for technicians who are trained across the major manufacturers.
Red Flags to Watch For
- Reluctance to provide a licence number when asked.
- No firm price before work begins.
- Pressure to replace an entire system before a proper diagnosis has been done.
- No local address or local trucks — a company with no presence in Durham Region can’t reliably hit a fast response time.
Choosing the right company up front saves you money and, in an emergency, saves you time. If you’re comparing options in Oshawa, ask us these same questions — we’re happy to answer them before you book.